Transcather valve prosthesis

ABSTRACT

A heart valve system, the system including a radially self-expandable tubular body, a valve, and a tubular fabric. The tubular body having an inflow end and an outflow end and including a plurality of struts with at least one motion buffer component integrated in the tubular body. The valve being coupled to the tubular body and including a plurality of valve leaflets. The fabric being disposed over an outer surface of the tubular body and over an outer surface of the motion buffer component. Additionally, when the outflow end of the tubular body moves radially inward from movement of the valve leaflets, the motion buffer component being configured so as to not move radially inward with the outflow end of the tubular body.

BACKGROUND

Heart valve diseases affect approximately 300,000 people worldwide eachyear. Those diseases translate in abnormal leaflet tissue, for example,excess tissue growth, tissue degradation/rupture, or tissuehardening/calcifying. Those diseases may also translate in abnormaltissue position through the cardiac cycle of the heart, for example,annular dilation or ventricular reshaping. Such abnormal leaflet tissueand abnormal tissue position may lead to degradation in valve functionincluding leakage/blood backflow (valve insufficiency) or a resistanceto blood forward flow (valve stenosis).

A valve replacement procedure is a minimally invasive surgical procedurein which a patient's defective heart valve is repaired. Thus, theabnormal leaflet tissue or the abnormal tissue position may be repairedin order to restore operability of the heart valve. In a valvereplacement procedure, a valve prosthesis is delivered to the patient'snative heart valve without removing the patient's native heart valve.Instead, the valve prosthesis replaces the functions of the native heartvalve.

SUMMARY

Various embodiments of the invention provide a heart valve system. Thesystem may include a radially self-expandable tubular body having aninflow end and an outflow end. The tubular body may include a pluralityof struts with at least one motion buffer component integrated in thetubular body. A valve may be coupled to the tubular body, the valveincluding a plurality of valve leaflets. A fabric may be disposed overan outer surface of the tubular body and over an outer surface of themotion buffer component. Additionally, when the outflow end of thetubular body moves radially inward from movement of the valve leaflets,the motion buffer component may be configured so as to not move radiallyinward with the outflow end of the tubular body.

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings, like reference characters generally refer to the sameparts throughout the different views. The drawings are not necessarilyto scale, emphasis instead generally being placed upon illustrating theprinciples of the invention. In the following description, variousembodiments are described with reference to the following drawings, inwhich:

FIG. 1 schematically shows a transcatheter valve prosthesis according toembodiments.

FIG. 2 schematically shows a transcatheter valve prosthesis in acontracted configuration according to embodiments.

FIGS. 3A and 3B schematically show a transcatheter valve prosthesisaccording to embodiments.

FIGS. 4A and 4B schematically show close-up views of transcatheter valveprostheses according to embodiments.

FIG. 5 schematically shows a tubular body of a transcatheter valveprosthesis according to embodiments.

FIG. 6 schematically shows a tubular body of a transcatheter valveprosthesis according to embodiments.

FIG. 7 schematically shows a tubular body of a transcatheter valveprosthesis according to embodiments.

FIG. 8 schematically shows a close-up of a tubular body of atranscatheter valve prosthesis according to embodiments.

FIG. 9 schematically shows a transcatheter valve prosthesis according toembodiments.

FIG. 10 schematically shows a transcatheter valve prosthesis accordingto embodiments.

FIG. 11 schematically shows a tubular body of a transcatheter valveprosthesis according to embodiments.

FIG. 12 schematically shows a tubular body of a transcatheter valveprosthesis according to embodiments.

FIGS. 13A and 13B schematically show a transcatheter valve prosthesisaccording to embodiments.

FIG. 14 schematically shows a close-up of a tubular body of atranscatheter valve prosthesis according to embodiments.

FIG. 15 schematically shows a transcatheter valve prosthesis implantedin a patient according to embodiments.

FIG. 16 schematically shows a transcatheter valve prosthesis implantedin a patient according to embodiments.

DETAILED DESCRIPTION OF EMBODIMENTS

The following detailed description refers to the accompanying drawingsthat show, by way of illustration, specific details in which thedisclosed embodiments may be practiced. Other embodiments may beutilized and structural and logical changes may be made withoutdeparting from the scope of the present disclosure. The variousembodiments are not necessarily mutually exclusive, as some aspects ofembodiments can be combined with one or more aspects of otherembodiments to form additional embodiments.

The disclosed embodiments are directed toward a transcatheter valveprosthesis 1 for functional replacement of a patient's native heartvalve in a connection channel. The patient's native heart valve may be,for example, a mitral valve or a tricuspid valve. Transcatheter valveprosthesis 1 may serve as an artificial replacement valve for thepatient's native valve.

As shown in FIG. 1, transcatheter valve prosthesis 1 includes aradially, self-expandable tubular body 5 having an inflow end 10 and anoutflow end 15 (according to the direction of blood flow when the systemis implanted in a patient) extending along longitudinal axis 20. In someembodiments, tubular body 5 may be balloon expandable. Tubular body 5may include a circumferential portion 3, formed of a mesh-likestructure, which is delivered within a patient via a delivery catheter.The mesh-like structure of tubular body 5 may include a plurality ofstruts 9 formed of a superalloy and/or a shape memory alloy includingnickel, titanium, and/or precious metals (e.g., gold). In someembodiments, tubular body 5 is formed of Nitinol. In other embodiments,tubular body 5 is formed of polymers including polyvinyl-chloride,polystyrene, polypropylene, and/or another polymer. For example, tubularbody 5 may be formed of one or more bioabsorbable polymers.

Tubular body 5 may be generally cylindrical in shape. Outflow end 15 oftubular body 5 may also include a frustoconical shape that slopesradially outward. Alternatively, outflow end 15 of tubular body 5 may betapered inward. Furthermore, FIGS. 1-16 show various configurations ofstruts 9 of tubular body 5. Thus, it is within the scope of the presentdisclosure to further modify the structure and configuration of struts9.

As shown in FIG. 1, one or more retaining rings 4 may be connected tocircumferential portion 3 at inflow end 10 of tubular body 5. Retainingrings 4 may aid in the delivery and removal of valve prosthesis 1 withina patient.

Tubular body 5 may include an outer preformed groove 7 that is open tothe radial outside of tubular body 5. Preformed groove 7 may be anindentation in the mesh-like structure of tubular body 5 that defines achannel. As shown in FIG. 1, preformed groove 7 may extend around anentire outer circumference of tubular body 5. In other embodiments,preformed groove 7 may extend less than the entire outer circumferenceof tubular body 5. Preformed groove 7 may be a continuous,non-interrupted groove, or may be an interrupted groove having, forexample, two or more groove portions. In some embodiments, preformedgroove 7 may be located at an axial distance, along axis 20, from bothinflow end 10 and outflow end 15 of tubular body 5. Thus, preformedgroove 7 may be axially spaced apart from proximal-most and distal-mostends of tubular body 5.

Preformed groove 7 may be delimited by projections (not shown) thatprotrude outward from tubular body 5. Thus, in some embodiments, tubularbody 5 may include a first set of projections that are disposed abovepreformed groove 7, in an inflow direction, and a second set ofprojections that are disposed below preformed groove 7, in an outflowdirection. Thus, the first and second set of projections may surround atop and bottom portion of preformed groove 7. The first and second setof projections may be directed toward each other. Additionally, thefirst and second set of projections may be members configured to piercetissue such as, for example, spikes, triangular projections, barbs, etc.

A tubular fabric 25 may be disposed on an outer surface of tubular body5 such that fabric 25 has an inflow end 30 and an outflow end 35. Fabric25 may cover an entire outer surface of circumferential portion 3 oftubular body 5, or only a portion of the outer surface ofcircumferential portion 3. As shown in FIG. 1, fabric 25 may be disposedwithin preformed groove 7 such that fabric 25 follows the contours ofpreformed groove 7. Fabric 25 may be slack or tightly disposed ontubular body 5. As discussed further below, a trapping member 150 may bedisposed around tubular body 5. Fabric 25 may be disposed on tubularbody 25 such that it is in a slack state until trapping member 150 isdisposed around tubular body 25. Thus, trapping member 150 may causefabric 25 to be moved into preformed groove such that fabric 25 is in atensioned state.

Fabric 25 may be formed of a polymer material including, for example,polyester fabric (e.g., DACRON® or other PTFE graft material).Additionally, or alternatively, fabric 25 may be formed of pericardiumand/or a metal mesh material (e.g. a metal mesh formed of Nitinol). Insome embodiments, fabric 25 may include one or more segments ofmaterial. For example, fabric 25 may include two, four, or six segmentsof material. The segments may be spaced apart, providing gaps betweenadjacent segments. Alternatively or in addition, some or all adjacentsegments may overlap. Fabric 25 may include one layer of material ormultiple layers of materials. In some embodiments, fabric 25 may includea coating or a liner.

Fabric 25 may be attached to tubular body 5 through any known securingmechanism. For example, fabric 25 and tubular body 5 may be securedthrough an adhesive and/or sutures. As shown in FIGS. 1 and 2, fabric 25may be configured to assume a deployed, expanded configuration and acontracted, reduced configuration with tubular body 5. Thus, fabric 25may be expanded and contracted based on the state of tubular body 5.

Tubular body 5 may be coupled to an artificial heart valve 40 such thatat least a portion of valve 40 extends distally beyond outflow end 15 oftubular body 5 (FIG. 3A). As shown in FIG. 3B, valve 40 may include aplurality of valve leaflets 45. Valve 40 may serve as an artificialreplacement for a patient's native heart valve (for example, a mitraland/or a tricuspid valve).

Tubular body 5 may be coupled to valve 40 such that an outercircumferential edge 50 of leaflets 45 is directly connected to outflowend 35 of fabric 25 (FIGS. 4A and 4B). Thus, as shown in FIGS. 3A, 4A,and 4B valve leaflets 45 may extend distally of outflow end 15 oftubular body 5 in an outflow direction. Valve leaflets 45 may also bedistal of preformed groove 7 in an outflow direction. Outercircumferential edge 50 of leaflets 45 may axially overlap with outflowend 35 of fabric 25 such that outer circumferential edge 50 is connectedto outflow end 35 with one or more sutures 55. Additionally oralternatively, outer circumferential edge 50 may be connected to outflowend 35 with any suitable securing mechanism, such as, for example, anadhesive, clips, clamps, etc.

Furthermore, tubular body 5 may be directly connected to fabric 25 suchthat struts 9 of tubular body 5 are connected to fabric 25 with one ormore sutures 55 (FIG. 4A). Additionally or alternatively, struts 9 maybe connected to fabric 25 with any suitable securing mechanism, such as,for example, an adhesive, clips, clamps, etc. Thus, as shown in FIG. 4A,valve leaflets 45 are not directly connected to tubular body 5.Therefore, valve 40 is also not directly connected to tubular body 5.Instead, valve 40 is indirectly connected to tubular body 5 throughfabric 25.

As shown in FIGS. 4A and 4B, outer circumferential edge 50 of valveleaflets 45 may be disposed on an inflow side of valve 40. Thus, outercircumferential edge 50 of valve leaflets 45 may be directly connectedto outflow end 35 of fabric 25 such that outer circumferential edge 50of valve leaflets 45 axially overlaps with outflow end 35 of fabric 25in order to provide the direct connection between valve 40 and fabric25.

Furthermore, struts 9 of tubular body 5 that are directly connected tofabric 25 may be struts 12 located at outflow end 15 of tubular body 5(FIGS. 1 and 4A). Struts 12 may axially overlap with fabric 25. Thus,struts 12 may provide the direct connection between tubular body 5 andfabric 25.

In some embodiments, the connection between fabric 25 and struts 12 oftubular body 5 may be located closer to inflow end 10 of tubular body 5than the connection between fabric 25 and outer circumferential edge 50of valve leaflets 45 (FIGS. 4A and 4B). Thus, the connection betweenfabric 25 and tubular body 5 may be proximal of the connection betweenfabric 25 and valve 40 (FIGS. 4A and 4B). It is further contemplatedthat the connection between fabric 25 and tubular body 5 may be locatedat the same axial position as the connection between fabric 25 and valve40 such that the connections axially overlap.

Additionally, as shown in FIGS. 4A and 4B, outer circumferential edge 50of valve leaflets 45 may be disposed distal of, in an outflow direction,of struts 12. Thus, outer circumferential edge 50 may be disposed distalof, in an outflow direction, of circumferential portion 3 of tubularbody 5. Accordingly, outer circumferential edge 50 of valve leaflets 45may not radially overlap with circumferential portion 3 of tubular body5.

As discussed above, outer circumferential edge 50 of valve 40 isconnected to outflow end 35 of fabric 25 such that valve leaflets 45extend distally of outflow end 15 of tubular body 5 in an outflowdirection (FIGS. 3A and 4B). Thus, valve 40 may not axially overlap withcircumferential portion 5 of tubular body 5, and tubular body 5advantageously has an increased compression capability. Therefore,tubular body 5 may be compressed further than conventional valveprostheses, allowing tubular body 5 to assume a smaller deliveryprofile.

In other alternative embodiments, valve 40 may be directly connected tooutflow end 15 of tubular body 5 through one or more sutures 55.Additionally or alternatively, valve 40 may be directly connected tooutflow end 15 of tubular body 5 with any suitable securing mechanism,such as, for example, an adhesive, clips, clamps, etc. In theseembodiments, valve leaflets 45 may be directly connected to struts 12such that valve leaflets 45 are connected to outflow end 15 of tubularbody 5. Additionally, valve leaflets 45 may be directly connected tofabric 25 and/or fabric 25 may be directly connected to struts 12.

As shown in FIGS. 4A and 4B, outflow end 35 of fabric 25 may not extenddistally, in an outflow direction, beyond outer circumferential edge 50of leaflets 45. Thus, outflow end 35 may terminate at the location ofouter circumferential edge 50. Although outflow end 35 of fabric 25 mayextend distally beyond struts 12 of tubular body 5, outflow end 35 offabric 25 does not wrap around struts 12. Thus, fabric 25 does not wraparound outflow end 15 of tubular body 5. In some embodiments, outflowend 35 of fabric 25 only wraps partially around struts 12 (and, thus,partially around outflow end 15 of tubular body 5). In theseembodiments, outflow end 35 of fabric 25 does not completely wrap aroundstruts 12. In yet other alternative embodiments, outflow end 35 offabric 25 wraps completely around outflow end 15 of tubular body 5.

As shown in FIG. 5, struts 12 of tubular body 5 may form a plurality ofarched beams 60 at outflow end 15 of tubular body 5. Beams 60 may bedirectly connected to fabric 25, as discussed above. Thus, beams 60 maybe connected to fabric 25 such that valve leaflets 45 extend distally ofbeams 60 in an outflow direction, as discussed above. Each beam 60 maybe directly connected to an adjacent beam 60 so that the plurality ofbeams 60 extends around the entire circumferential length of tubularbody 5 at outflow end 15. Additionally, adjacent beams 60 may bedirectly attached such that beams 60 are continuous along the entirecircumference of tubular body 5 at outflow end 15.

Tubular body 5 may include a proximal-most end 13 at inflow end 10 and adistal-most end 14 at outflow end 15. As shown in FIGS. 5-7, archedbeams 60 may form distal-most end 14 of tubular body 5. Furthermore,beams 60 may each include a first end 67 and a second end 69 such thatsecond ends 69 are distal of first ends 67 in an outflow direction.First and second ends 67, 69 may form the arched shape of beams 60.Additionally, second ends 69 may form a commissural attachment area forattachment to valve leaflets 45.

As shown in FIGS. 5-7, for example, second ends 69 of beams 60 may beconnected to one or more retaining components 78. Thus, distal-most end14 of tubular body 5 may also be connected to retaining components 78.In some embodiments, retaining components 78 are distal ofcircumferential portion 3 of tubular body 5 in an outflow direction.Retaining components 78 may aid in anchoring tubular body 5 within apatient. Fabric 25 may disposed over tubular body 5 such that fabric 25is not disposed over retaining components 78. In some embodiments,fabric 25 may not extend distally of distal-most end 14 of tubular body5 in an outflow direction. Thus, fabric 25 may not extend distally ofretaining components 78.

In some embodiments, each valve leaflet 45 may be supported by only twobeams 60 of the plurality of beams 60. Thus, for example, as shown inFIGS. 3B and 5, a single valve leaflet 45 may be supported by first beam61 and second beam 63. Each valve leaflet 45 may be supported by beams61 and 63 such that the valve leaflet 45 is directly connected to fabric25 that is directly connected to beams 61 and 63, as discussed above.Thus, the connections between valve leaflets 45, fabric 25, and beams 60provide the support between beams 60 and valve leaflets 45. In otherembodiments, each valve leaflet 45 may be supported by two, three, ormore beams 60. Although FIGS. 5-7 show six beams, it is alsocontemplated that more or less beams may be used. Thus, tubular body 5may include at least six beams 60.

As shown in FIGS. 5-7, connection points 65 may directly link inflow end10 of tubular body 5 with beams 60. All direct links between inflow end10 and beams 60 may be provided only by connection points 65. In theembodiments of FIG. 5-7, three connection points 65 are provided. Thenumber of connection points 65 may be equivalent to the number of valveleaflets 45, as shown in FIG. 3B. Thus, in other embodiments, four, fiveor more connection pointes 65 may be provided, depending on the numberof valve leaflets 45. In some embodiment, as shown in FIGS. 5-7, firstends 67 of beams 60 provide connection points 65.

By providing a direct link between inflow end 10 and beams 60,connection points 65 may provide a decorrelation of movement betweeninflow end 10 of tubular body 5 and beams 60. Thus, connection points 65may dissociate axial and radial movements between inflow end 10 andbeams 60. For example, connection points 65 may be configured toattenuate movement of inflow end 10 of tubular body 5. Thus, movement ofinflow end 10 is not completely transferred to beams 60. Instead,connection points 65 may absorb movement of inflow end 10, thusproviding the decorrelation effect. In some embodiments, connectionpoints 65 absorb all movement of inflow end 10. In other embodiments,connection points 65 absorb only partial movement of inflow end 10.

As shown in FIGS. 5-7, inflow end 10 of tubular body 5 includes struts 9with peaks 70 and valleys 75. Peaks 70 are disposed proximally ofvalleys 75 such that valleys 75 are located closer to outflow end 15 oftubular body 5 than peaks 70. Furthermore, peaks 70 and valleys 75 mayform proximal-most end 13 of tubular body 5.

In some embodiments, peaks 70 and valleys 75 may be configured such thatmovement of peaks 70 radially inward may cause valleys 75 to flareradially outward (FIG. 8). For example, when tubular body 5 is implantedin a patient, the patient's atrial wall may push radially inward onpeaks 70 (due to normal systolic movement of the patient's nativevalve). This causes peaks 70 to deform and move radially inward, asshown in FIG. 8. Accordingly, the inward movement by peaks 70 causesvalleys 75 to deform and move radially outward. The deformation ofvalleys 75 radially outward pushes inflow end 10 further into contactwith the patient's atrial wall, thus improving the sealing effect ofinflow end 10 within the patient.

When fabric 25 is disposed over tubular body 5, as discussed above,movement of peaks 70 radially inward may cause both valleys 75 andfabric 25 to flare radially outward. Thus, fabric 25 is pushed furtherinto contact with the patient's atrial wall, along with valleys 70, inorder to further increase the sealing effect of tubular body 5 withinthe patient.

As shown in FIGS. 1 and 9, for example, outflow end 15 of tubular body 5may include beams 60 and a proximal section 80. Both beams 60 andproximal section 80 may be disposed distal, in an outflow direction, ofpreformed groove 7. Proximal section 80 may also be disposed distally ofpeaks 70 and valleys 75 in an outflow direction. Furthermore, beams 60may be disposed distal, in an outflow direction, of proximal section 80.Accordingly, as shown in FIG. 10, movement of proximal section 80radially inward may cause inflow end 10 of tubular body 5 to flareradially outward. For example, natural movement of a patient's nativevalve may cause an inward compression on tubular body 5. Morespecifically, in some examples, the patient's native valve may cause aninward compression on valve leaflets 45, which in turn may cause aninward compression on tubular body 5. Thus, such a compression may causeproximal section 80 to be compressed radially inward. Due to thestructure of tubular body 5, movement of proximal section 80 radiallyinward causes inflow end 10 to flare radially outward. The outwardmovement of inflow end 10 may increase the sealing effect between inflowend 10 and a patient's atrial wall, thus advantageously providing atighter seal between tubular body 5 and the patient's atrial wall.Furthermore, when proximal section 80 moves radially inward and inflowend 10 flares radially outward, beams 60 may not move. Thus, connectionpoints 65 may dissociate such movement of proximal section 80 from beams60.

As shown in FIGS. 9 and 10, connection points 65 may be disposed inproximal section 80. Alternatively, connection points 65 may be disposeddistal of proximal section 80 in an outflow direction. Furthermore, insome embodiments, valve leaflets 45 may extend entirely distal ofproximal section 80 in an outflow direction. In other embodiments, valveleaflets 45 may axially overlap with proximal section 80.

FIG. 11 shows an additional configuration of struts 9 in which inflowend 10 of tubular body 5 includes struts 9 with an S-shape. The S-shapedstruts may be directly connected to peaks 70 such that both peaks 70 andvalleys 75 are disposed above the S-shaped struts in an inflowdirection, when tubular body 5 is in an expanded state. The S-shapedstruts may each form a decorrelation portion that dissociates movementsbetween proximal-most end 13 of tubular body 6 and outflow end 15 oftubular body 5. Thus, the S-shaped struts may be configured to stressand compress in reaction to movement in inflow end 10 or outflow end 15.Thus, because the S-shaped struts stretch and/or compress, movement fromone end of the tubular body 5 does not translate/communicate to theother end of the tubular body 5. The S-shaped struts may be disposedentirely proximal of preformed groove 7 in an inflow direction.

In some embodiments, tubular body 5 may include a motion buffercomponent 90 integrated in tubular body 5 (FIGS. 11-13B). Motion buffercomponent 90 may include one or more struts 9 formed into, for example,a droplet shape (FIG. 11) or a triangular shape (FIG. 12). Motion buffercomponent 90 may be integral with the remainder of tubular body 5 suchthat tubular body 5 forms one unitary member. Additionally, fabric 25may be disposed over an outer surface of motion buffer component 90.

Movement of valve leaflets 45 within a patient may cause tubular body 5to also move within the patient. More specifically, valve leaflets 45may move inward and outward when replacing the functions of the nativevalve within a patient. Such movement may cause, for example, outflowend 15 of tubular body 5 to be pushed radially inward and outward withregard to the patient's atrial wall. Such movement of outflow end 15also causes fabric 25 to be pushed radially inward and outward withregard to the patient's atrial wall. This movement of fabric 25 againstthe patient's native valve may cause friction and wear on fabric 25.Furthermore, tubular body 5 may also suffer from friction and wear bycontinued contact with the patient's native valve.

Motion buffer component 90 may create a bumper effect to reduce suchfriction and wear on fabric 25 and tubular body 5. For example, as shownin FIGS. 13A and 13B, when outflow end 15 of tubular body 5 movesradially inward from movement of valve leaflets 45, motion buffercomponent 90 may be configured to not move radially inward with outflowend 15. Instead, motion buffer component 90 may move radially outward ormay stay in its position in reaction to the inward movement of outflowend 15. Thus, motion buffer component 90 may push radially outward,against fabric 25 and against the patient's native valve leaflets, whenoutflow end 15 moves radially inward. Such radially outward pushing bymotion buffer component 90 may create the bumper effect. Thus, whenoutflow end 15 and fabric 25 are pushed from the radially inwardposition to the radially outward position (due to movement of valveleaflets 45), because motion buffer component 90 already protrudesoutward, motion buffer component 90 provides a cushioning effect tosoften the radially outward force of outflow end 15 and fabric 25 on thepatient's native valve leaflets.

Accordingly, motion buffer component 90 may absorb friction and wear ontubular body 5 that are caused from movement of valve leaflets 45. Thus,motion buffer component 90 may advantageously make tubular body 5,especially beams 60, more durable. Additionally, motion buffer component90 may absorb friction and wear on fabric 25 that are caused frommovement of valve leaflets 45. Thus, motion buffer component 90 may alsoadvantageously make fabric 25 more durable.

FIG. 13A shows a neutral state of tubular body 5, and FIG. 13B shows astate of tubular body 5 in which outflow end 15 is moved radially inwardand motion buffer component 90 is moved radially outward. The structureand/or location of motion buffer component 90 may enable motion buffercomponent 90 to move radially outward or to stay in its position inresponse to the inward movement by outflow end 15. As shown in FIGS.11-13B, motion buffer component 90 may be disposed adjacent to beams 60and distal of preformed groove 7 in an outflow direction. Motion buffercomponent 90 may be disposed within proximal section 80. Additionally, astrut width of motion buffer component 90 may be smaller than a strutwidth of beams 60. Thus, motion buffer component 90 may have sufficientflexibility to move radially outward or to stay in its position, asdiscussed above.

In some embodiments, motion buffer component 90 may be located at thesame cross-section as valve leaflets 45 in a radial direction. Thus,motion buffer component 90 and valve leaflets 45 may overlap axiallyalong longitudinal axis 20. Additionally, motion buffer component 90 maybe located at least in part at the same cross-section as connectionpoints 65 in a radial direction. Thus, motion buffer component 90 andconnection points 65 may overlap axially along longitudinal axis 20.

FIG. 14 shows an embodiment in which tubular body 5 includes struts 9with different thicknesses. Thus, for example, struts 9 may includerelatively smaller thicknesses 100 and relatively larger thicknesses110. Furthermore, struts 9 may be curved in order to form first cells120 and second cells 130. As shown in FIG. 14, first cells 120 areformed by the struts with relatively smaller thicknesses 100 and secondcells 130 are formed by the struts with the relatively largerthicknesses 110. Additionally, third cells 140 may be disposed betweenfirst cells 120 and second cells 130. Third cells may be formed by boththe struts with the relatively smaller thicknesses 100 and the strutswith the relatively larger thicknesses 110.

First cells 120, second cells 130, and third cells 140 may be configuredto open and expand uniformly when tubular body 5 is opened and expanded.Thus, the struts with relatively smaller and larger thicknesses 100, 110allow all cells 120, 130, 140 to open together at the same rate. Incontrast, in traditional prosthesis devices, some strut cells mayrequire less outward force to open, depending on their placement in themesh structure of the prosthesis device. Therefore, some struts cellsmay open easier and quicker than other strut cells. Such results in theprosthesis being expanded and opened non-uniformly. For example, thestrut cells that open easier may fully open before the strut cells thatare harder to open. Such non-uniform expansion may result in inaccurateplacement of the prosthesis device and may alter the prosthetic valve'sperformance. Because cells 120, 130, 140 open together at the same rate,valve prosthesis 1 expands uniformly during manufacturing (e.g., duringits heat shaping process). Accordingly, cells 120, 130, 140 provide aprosthesis device that is easier to manufacture compared to traditionalprosthesis devices.

In the embodiment of FIG. 14, the struts with the relatively largerthicknesses 110 may be placed at locations on tubular body 5 that openrelatively easier. The struts with the relatively smaller thicknesses100 may be placed at locations on tubular body 5 that open withrelatively more difficultly. Thus, the thickness of the struts maycounter balance with the ease of opening in order to provide uniformexpansion across all cells of tubular body 5.

All embodiments of valve prosthesis 1 may include positioning and/ororientation devices (not shown) to facilitate relative and/or absolutepositioning of tubular body 5. These devices may include passive markersthat are fixedly attached to tubular body 5. The passive markers may bemade from materials different from the materials of tubular body 5 inorder to improve contrast during medical imaging, e.g., using magneticresonance or X-ray based imaging techniques. The passive markers may,for example, be made of highly radio-opaque materials thereby allowingone to precisely acquire the relative and/or absolute position of thecomponents of valve prosthesis 1 with respect to the patient's body.

The structure of valve prosthesis 1 may allow for a smaller outerprofile than conventional prosthesis. Thus, for example, valveprosthesis 1 may be sized according to human anatomies and may becompressed into a 26F ID tubing catheter for delivery within a patient.Additionally, because valve leaflets 45 extend distally beyond tubularbody 5, the size of the frame of tubular body 5 required to supportvalve 40 may be reduced. For example, the number of struts 9 may bereduced, thus providing a more flexible structure. Additionally, theconfiguration of valve prosthesis 1 provides a better geometricalstability for valve leaflets 45 compared to conventional prosthesis.

As shown in FIG. 15, valve prosthesis 1 may be deployed, via a catheter,to a patient. The method of delivering valve prosthesis 1 may includedelivering, from a delivery catheter, tubular body 5 and valve 40. Next,tubular body 5 and valve 40 may be expanded such that beams 60 oftubular 5 are disposed against tissue of a patient's connection channelbetween an atrial and a ventricular chamber of a heart. Thus, forexample, valve prosthesis 1 may be delivered to a patient's defectivemitral or tricuspid valve in order to restore operability. Valveprosthesis 1 may be delivered to a patient so that the preformed groove7 is located on the ventricular side of the annulus of the native valve(e.g., having a distance from the native valve annulus).

To place valve prosthesis 1 within the patient's heart valve, thefollowing approaches may be applied: (1) an arterial retrograde approachentering the heart cavity over the aorta, (2) through a venous accessand through a puncture through the inter atrial septum (trans-septalapproach), (3) over a puncture through the apex of the heart (trans-apical approach), (4) over a puncture through the atrial wall fromoutside the heart, (5) arterial access (e.g., from the femoral arterythrough a puncture in the groin), (6) directly through the vena cava andinto the right atrium (for a tricuspid valve replacement, for example),or (7) any other approach known to a skilled person.

For functional replacement of a patient's heart valve, valve prosthesis1 may be fixed relative to the patient's connection channel wallstructure such that an exterior of valve prosthesis 1 is sealed againstblood flow. To achieve this, tissue of the patient's connection channelwall structure adjacent to the preformed groove 7 may be forced orplaced inside preformed groove 7.

The method may further include advancing a trapping member 150 aroundtubular body 5 and around preformed groove 7. Thus, trapping member 150may trap portions of native valve leaflets 160 and/or chords 170 inpreformed groove 7. Such may help secure tubular body 5 in a patient.Trapping member 150 may include a full or partial loop. Additionally,trapping member 150 may be moved around tubular body 5 after tubularbody 5 is fully expanded or when tubular body 5 is only partiallyexpanded. Trapping member 150 may be loosely disposed within preformedgroove such that an interference fit between trapping member 150 andpreformed groove 7 secures tubular body 5 in place. Thus, trappingmember 150 may serve to anchor valve prosthesis 1 within the patient. Inother embodiments, trapping member 150 may exert an inward, radial forceon tubular body 5 in order to anchor valve prosthesis 1 within thepatient. Thus, in this embodiment, trapping member 150 may exert africtional force on the native valve leaflets 160 and/or chords 170.

Trapping member 150 may include a delivery configuration within adelivery catheter and a deployment configuration wherein trapping member150 is deployed from the delivery catheter. In embodiments, trappingmember 150 may be biased to the deployment configuration. For example,trapping member 150 may include a shape-memory alloy such as a Nitinolor a Nitinol-based alloy.

In some embodiments, an elongate outer member 180 may also be advancedaround tubular body 5 and around preformed groove 7. Elongate outermember 180 may encircle tubular body 5 after tubular body 5 is fullyexpanded or when tubular body 5 is only partially expanded. Elongateouter member 180 may force the patient's native valve leaflets 160and/or chords 170 in preformed groove 7. Trapping member 150 may then bedisposed over and along elongate outer member 180 in order to advancetrapping member 150 around tubular body 5 and into preformed groove 7.Elongate outer member 180 may then be removed from the patient aftertrapping member 150 is disposed around tubular body 5. After elongateouter member 180 is removed from the patient, trapping member 150 maymaintain the patient's native valve leaflets 160 and/or chords 170 inpreformed groove 7.

In some embodiments, elongate outer member 180 may be a guidewire.Elongate outer member 180 may have a diameter smaller than a diameter oftrapping member 150.

The disclosed methods of using valve prosthesis 1 may result in fixationof tubular body 5 in the patient's connection channel wall structurewith minimal occlusion of the patient's native valve.

The disclosed embodiments also include a method for manufacturing valveprosthesis 1. The method for manufacturing may include directlyconnecting outer circumferential edge 50 of valve 40 with outflow end 35of fabric 25 to form a sub-assembly. Next, tubular body 5 may be slidinto the sub-assembly. Then, tubular body 5 may be connected to thesub-assembly to form an assembly such that valve leaflets 45 extenddistally of outflow end 15 of tubular body 5 in an outflow direction.Tubular body 5 may be directly connected to the sub-assembly byconnecting outflow end 15 of tubular body 5 with fabric 25. As shown inFIGS. 4A and 4B, fabric 25 may be directly connected to outercircumferential edge 50 and directly connected to tubular body 5 withone or more sutures 55.

1. A heart valve system, the system comprising: a radiallyself-expandable tubular body having an inflow end and an outflow end,the tubular body including a plurality of struts with at least onemotion buffer component integrated in the tubular body; a valve coupledto the tubular body, the valve including a plurality of valve leaflets;and a fabric disposed over an outer surface of the tubular body and overan outer surface of the motion buffer component, wherein: the tubularbody includes a plurality of beams at the outflow end of the tubularbody, the plurality of beams providing connection points between theinflow end and the plurality of beams, a number of connection pointsbeing equivalent to a number of the valve leaflets, a strut width of themotion buffer component is smaller than a strut width of the beams, andwhen the outflow end of the tubular body moves radially inward frommovement of the valve leaflets, the motion buffer component isconfigured so as to not move radially inward with the outflow end of thetubular body.
 2. The system according to claim 1, wherein the motionbuffer component is configured to move radially outward when the outflowend of the tubular body moves radially inward.
 3. The system accordingto claim 2, wherein the motion buffer component is configured to pushradially outward against the fabric when the outflow end of the tubularbody moves radially inward.
 4. The system according to claim 1, whereinthe motion buffer component includes a droplet shape or a triangularshape.
 5. The system according to claim 1, further including a trappingmember configured to form at least a partial loop encircling the tubularbody to trap portions of native valve leaflets and/or chords.
 6. Thesystem according to claim 5, further including an elongate outer memberconfigured to encircle the tubular body such that the trapping member isdisposed over and along the elongate outer member. 7-8. (canceled) 9.The system according to claim 1, wherein the motion buffer component islocated at the same cross-section as the valve leaflets in a radialdirection.
 10. The system according to claim 1, wherein the motionbuffer component is located at least in part at the same cross-sectionas the connection points in a radial direction.